Renesas SLG47513 Application Note
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Renesas SLG47513 Application Note

Renesas SLG47513 Application Note

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Electric Toothbrush
SLG47513
This application note describes how to use the SLG47513 to implement an electric toothbrush. The application
note comes complete with design files, which can be found in the References section.
Contents
1.
Introduction .................................................................................................................................................... 2
2.
GreenPAK Design .......................................................................................................................................... 2
2.1
Motor Control ......................................................................................................................................... 3
2.2
Charging ................................................................................................................................................ 4
2.3
Simulation of Project .............................................................................................................................. 6
3.
Conclusions ................................................................................................................................................... 6
4.
Revision History ............................................................................................................................................ 7
References
For related documents and software, please visit:
https://www.renesas.com/eu/en/products/programmable-mixed-signal-asic-ip-products/greenpak-programmable-
mixed-signal-products
Download our free GreenPAK Designer software [1] to open the .gp file [2] and view the proposed circuit design.
Use the GreenPAK development tools [3] to freeze the design into your own customized IC in a matter of minutes.
Renesas Electronics provides a complete library of application notes [4] featuring design examples, as well as
explanations of features and blocks within the Renesas IC.
[1]
GreenPAK Go Configure Software
[2]
AN-CM-360 Electric
[3]
GreenPAK Development
[4]
GreenPAK Application
R19AN0229EU0100
May 24, 2023
Hub, Software Download and User Guide, Renesas Electronics
Toothbrush.gp6, GreenPAK Design File, Renesas Electronics
Tools, GreenPAK Development Tools Webpage, Renesas Electronics
Notes, GreenPAK Application Notes Webpage, Renesas Electronics
Rev.1.00
Application Note
Page 1
© 2023 Renesas Electronics

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Summary of Contents for Renesas SLG47513

  • Page 1 Application Note Electric Toothbrush SLG47513 This application note describes how to use the SLG47513 to implement an electric toothbrush. The application note comes complete with design files, which can be found in the References section. Contents Introduction ..............................2 GreenPAK Design ............................2 Motor Control ............................
  • Page 2 They often use nickel-metal hydride (NiMH) batteries, whose nominal voltage is 1.2 V. The SLG47513 has a working voltage range from 1 V to 1.65 V, enabling control over the toothbrush’s operation. Figure 1. General Schematic of Electric Toothbrush Based on SLG47513 2.
  • Page 3 Electric Toothbrush Figure 2. Electric Toothbrush GreenPAK Designer Schematic Motor Control When the toothbrush is in sleep mode, Pin 8 output is set to HIGH due to a pull-up resistor, but when a button is pressed, a low-level signal appears for a brief period. To filter out switch bouncing, a Delay macrocell DLY4 is used.
  • Page 4 Figure 1). The divider comprises external resistors R7 (100 kΩ) and R5 (4.7 kΩ), and an internal pull-down resistor (10 kΩ) inside the SLG47513, which sets the peak value of the voltage on Pin 6 at around 1.2 V. When the signal from the charger reaches Pin 6, which functions as an analog comparator, a HIGH level appears at the input of a frequency detector.
  • Page 5 Electric Toothbrush goes to Pin 5 and enables charging (see Figure 5 Figure 6). This high-level signal at the output of Pin 5 opens a Q2 transistor, which, in turn, opens a Q1 transistor, initiating the charging process of the battery. Figure 5 Signal from Charger at Input of Pin 6 and Output Enable at Pin 5 Figure 6 Signals at Input of Pin 6 and Output of Pin 5 during the Process of Disconnecting Charger To protect the battery against overcharging, an analog comparator ACMP1H is used.
  • Page 6 The SLG47513 is a low-voltage GreenPAK IC. Its low-voltage operation allows the project to be supplied by just one 1.2 V NiMH battery, which is the primary power source for electric toothbrushes. The SLG47513 is a perfect fit for these devices as it has a sufficient number of digital and analog macrocells that can be used to control the toothbrush motor and implement additional features such as timers and charging control.
  • Page 7 Electric Toothbrush 4. Revision History Revision Date Description 1.00 May 24, 2023 Initial release. R19AN0229EU0100 Rev.1.00 Page 7 May 24, 2023...
  • Page 8 Renesas' products are provided only subject to Renesas' Terms and Conditions of Sale or other applicable terms agreed to in writing. No use of any Renesas resources expands or otherwise alters any applicable warranties or warranty disclaimers for these products.

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